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Cairo makes it possible to create gradients whose extreme objects are
defined with double precision coordinates, but it internally
represents them with 24.8 fixed point precision.
This shows that coordinates that don't fit the valid range are
mishandled and don't even trigger an error status.
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Cairo represents gradients coordinate with 24.8 fixed point precision,
but pixman uses 16.16 fixed point coordinates.
This shows that cairo is currently unable to handle gradients with
coordinates which are valid for cairo but not for pixman.
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Instead of tagging the sources, which is insensitive to changes, track the
known failure modes by recording the current fail as an xfail.png
reference. (We also introduce a new.png to track a fresh error, so that
they are not lost in the noise of the old XFAILs and hopefully do not
cause everyone to fret).
As we have removed the XFAIL tagging we find, surprise surprise, that some
tests are now working -- so review all the reference images (as also some
.ref.png now should be .xfail.png).
Note: I've only checked image,pdf,ps,svg. The test surfaces report some
failures that probably need to addressed in source. I've not correct the
changes for win32 and quartz. Nor fixed up the experimental backends.
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Also test the handling of radial gradients with large radii.
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